Takashi Hayakawa
58Patents
7h-index
105Co-inventors
75Inventor score
Filing activity: Oct 11, 1974 → Nov 1, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6459034B2 | Multi-junction solar cell | Emerging Cross-Sectional Technologies | 46 | Expired |
| US5804479A | Method for forming semiconductor integrated circuit device having a capacitor | Electricity | 46 | Expired |
| US5426488A | Method of charging a built-in electrophotographic charge member | Physics | 29 | Expired |
| US6189485A | Plasma CVD apparatus suitable for manufacturing solar cell and the like | Emerging Cross-Sectional Technologies | 28 | Expired |
| US5398102A | Electrophotographic copier and charging means used therefor | Physics | 18 | Expired |
| USD334337S | Wire binder | General | 13 | Expired |
| US4994855A | Electrophotographic image formation apparatus with two bias voltage sources | Physics | 8 | Expired |
| US5933726A | Method of forming a semiconductor device have a screen stacked cell capacitor | Electricity | 7 | Expired |
| US4615299A | Plasma CVD apparatus for making photoreceptor drum | Electricity | 7 | Expired |
| US7108415B2 | Optical element with light extracting dots and display device using same | Physics | 7 | Expired |
| US5563691A | Image-forming apparatus | Physics | 6 | Expired |
| US5708929A | Contact charging image forming apparatus having improved image transfer | Physics | 6 | Expired |
| US9686201B2 | Predictive management of a network buffer | Electricity | 5 | Active |
| US4992348A | Electrophotographic photosensitive member comprising amorphous silicon | Physics | 5 | Expired |
| US5555079A | Image forming apparatus for preventing damage to conductive fibers on a charging member | Physics | 5 | Expired |
| US5164281A | Photosensitive body for electrophotography containing amorphous silicon layers | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5126499A | Process for the production of hydrocarbons with two or more carbon atoms from methane | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5057391A | Photosensitive member for electrophotography and process for making using electron cyclotron resonance | Physics | 5 | Expired |
| US8283253B2 | Pattern forming method, semiconductor device manufacturing method and semiconductor device manufacturing apparatus | Electricity | 4 | Active |
| US4853309A | Photoreceptor for electrophotography with a-Si layers having a gradient concentration of doped atoms and sandwiching the photoconductive layer therebetween | Physics | 4 | Expired |
| US5689778A | Image forming apparatus | Physics | 3 | Expired |
| US4400544A | Method for the preparation of cyclohexanone | Chemistry; Metallurgy | 3 | Expired |
| US5592263A | Charging device | Physics | 2 | Expired |
| US7542107B2 | Method of letting a sufficient quantity of light pass through each of apertures for entry of backlight | Physics | 2 | Active |
| US5100749A | Photosensitive member for electrophotography | Physics | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.